# MetaDataSet.java

    /*
     * Copyright (C) 2000 - 2026 Silverpeas
     *
     * This program is free software: you can redistribute it and/or modify
     * it under the terms of the GNU Affero General Public License as
     * published by the Free Software Foundation, either version 3 of the
     * License, or (at your option) any later version.
     *
     * As a special exception to the terms and conditions of version 3.0 of
     * the GPL, you may redistribute this Program in connection with Free/Libre
     * Open Source Software ("FLOSS") applications as described in Silverpeas's
     * FLOSS exception.  You should have received a copy of the text describing
     * the FLOSS exception, and it is also available here:
     * "http://www.silverpeas.com/legal/licensing"
     *
     * This program is distributed in the hope that it will be useful,
     * but WITHOUT ANY WARRANTY; without even the implied warranty of
     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     * GNU Affero General Public License for more details.
     *
     * You should have received a copy of the GNU Affero General Public License
     * along with this program.  If not, see <http://www.gnu.org/licenses/>.
     */

    package org.silverpeas.components.gallery.model;

    import org.silverpeas.components.gallery.process.media.GalleryLoadMetaDataProcess;
    import org.silverpeas.kernel.logging.SilverLogger;

    import java.io.Serializable;
    import java.util.ArrayList;
    import java.util.Collection;
    import java.util.LinkedHashMap;

    /**
     * A set of metadata embedded in a media.
     *
     * @author mmoquillon
     */
    public class MetaDataSet implements Serializable {

      private final LinkedHashMap<String, MetaData> metaData = new LinkedHashMap<>();

      /**
       * Creates an empty set of metadata
       */
      MetaDataSet() {
      }

      MetaDataSet(MetaDataSet metaData) {
        this.metaData.putAll(metaData.metaData);
      }

      /**
       * Loads the metadata of the specified media.
       *
       * @param media the internal media from which the metadata are loaded.
       */
      void load(InternalMedia media) {
        try {
          GalleryLoadMetaDataProcess.load(media);
        } catch (Exception e) {
          SilverLogger.getLogger(this).warn(e);
        }
      }

      /**
       * Adds a metadata.
       *
       * @param data a metadata.
       */
      public void addMetaData(MetaData data) {
        metaData.put(data.getProperty(), data);
      }

      /**
       * Gets a metadata according to the specified property name.
       *
       * @param property the property name for which the metadata is requested.
       * @return the metadata if it exists, null otherwise.
       */
      public MetaData getMetaData(String property) {
        return metaData.get(property);
      }

      /**
       * Gets all metadata property names.
       *
       * @return the list of metadata property names, empty list if no metadata.
       */
      public Collection<String> getMetaDataProperties() {
        Collection<MetaData> values = metaData.values();
        Collection<String> properties = new ArrayList<>();
        for (MetaData meta : values) {
          if (meta != null) {
            properties.add(meta.getProperty());
          }
        }
        return properties;
      }
    }